0.00 0.30 0.75 1.00

Sec Sec SEC SEC

20 5.081 20 5.081

% of R3 Ohm % of R3 Ohm

The three unblocking current thresholds namely, IN>, I2> and Imax should be set above the maximum expected residual current unbalance, the maximum negative sequence unbalance and the maximum expected power swing current. IN> 40% I2> 30 % Value of Imax line = 3 Inom NOTE: PSB Block Zone 2, Zone 3 & Zone 4 PSB Allowed to trip Zone 1 Unblocking timer: To be set to 2s typically to un block in case of a prolonged power swing. DISTANCE SCHEMES SETTING Program Mode Standard Scheme Standard Mode PUR Permissive under reach scheme Disabled Z1Ext Fail Trip mode 1 pole Z1 , CR Received SWITCH ON TO FAULT Switch on to fault logic is pre-set in MiCOM P444 I>3 Current Set 3.00A I>3 Time delay 3sec I>4 Status Disabled Operation on pick up of level detector method and activation of all zones is recommended.This time delay is not having role in SOTF/TOR logic. Since not possible to block time delay, keep a higher setting as 3 Sec.

OR

E F E

N E R

O E C

Y L N

BACK UP OVER CURRENT: Enable I>1 Current setting tI>1 Time delay EARTHFAULT OVERCURRENT PROTECTION IN>1 Function